The RST ADD Harness and switch kit is designed to work with your Tacoma, 4Runner, GX470, or Tundra when you have swapped out your electronic transfer case for a manual one.  It now takes the place of your computer to activate your front differential when you need 4wd.  This Harness can also be used when doing a 2wd to 4wd conversion using IFS parts. 

RST ADD harness and switch

Vehicle Type